This Week in Virology, Episode 1185: Weather, Post-Licensing Surveys, and Bird Pathogens
0:00:03 Introduction: The hosts discuss current weather conditions, highlighting a significant snowstorm in Camden, New York, and announce an immunologist position at the Rosenfeld laboratory.
0:05:24 American Society for Virology (ASV) 2025 Meeting: The annual meeting will be held in Montreal, with abstracts due on February 3rd and travel award applications due on February 5th.
0:05:53 Respiratory Syncytial Virus (RSV) Vaccine Update: The FDA has modified the prescribing information for two recently approved RSV vaccines (Abrysvo and Arexvy) due to a potential increased risk of Guillain-Barré syndrome observed in post-marketing surveillance.
0:08:19 Guillain-Barré Syndrome (GBS) and Vaccination: GBS can be caused by viral infections, including RSV, and is a rare side effect of some vaccines, including the 1976 swine flu vaccine. The risk of GBS from RSV infection may be higher than the risk associated with the vaccines.
0:10:19 RSV Vaccination in Older Adults: The RSV vaccines are recommended for individuals 60 years and older, with specific recommendations for those aged 60-75 with comorbidities.
0:13:59 RSV Vaccine Availability: There may be variations in recommendations and availability of the RSV vaccine, depending on state and pharmacy policies.
0:14:18 Human Metapneumovirus in China: Reports of increased respiratory infections, including human metapneumovirus, in northern China are considered a seasonal rise and not a cause for specific concern by the European CDC.
0:16:12 Discovery of New Viruses: Many viruses causing mild respiratory illnesses remain undiagnosed due to the lack of routine metagenomic sequencing, as highlighted by the discovery of human metapneumovirus in 2001.
0:17:28 Journal of Human Evolution Editorial Board Resignation: The entire editorial board of the Journal of Human Evolution resigned in protest of the publisher's (Elsevier) decision to replace copy editors with AI, which resulted in errors in published papers.
0:21:55 Global Distribution and Diversity of Wild Bird Associated Pathogens: A study analyzed data from over 1,800 studies, identifying 760 different pathogens associated with over 1,400 bird species, including viruses, bacteria, fungi, and protozoa.
0:23:24 Key Findings: Migratory birds carry a more diverse set of pathogens, with waterfowl carrying the highest number of zoonotic species, followed by songbirds.
0:26:02 West Nile Virus Example: Birds can act as vectors for diseases like West Nile virus, transmitting the virus to humans via mosquitoes or ticks.
0:34:36 Pathogen Distribution: Many pathogens are distributed across the Northern Hemisphere, with waterfowl having the highest variety of even-born pathogens and songbirds having the highest variety of mosquito- and tick-borne pathogens.
0:36:55 Sampling Bias: Reporting bias is a limitation of the study, as data are primarily derived from published literature, which may not represent all geographic areas equally.
0:42:24 Hotspots: The study identifies potential hotspots for bird-associated zoonotic pathogens in tropical regions, including Southeast Asia, Africa, South America, and the southeastern coast of North America.
0:44:47 Influenza Neuraminidase Antibody: Researchers identified a broadly inhibitory influenza neuraminidase antibody (4C402) from pre-existing memory B cells in healthy volunteers.
0:47:54 B Cell Receptor (BCR) Specificity: The discussion highlights the role of the BCR, specifically IGM and IGD, in early B cell responses and the potential for broadly neutralizing antibodies targeting conserved regions of neuraminidase.
0:55:30 Class Switching and Affinity Maturation: B cells undergo class switching and affinity maturation upon encountering an antigen, leading to the production of different antibody isotypes (e.g., IGG, IGA) with varying functionalities.
0:58:28 Pre-existing Immunity and Vaccination: Individuals with pre-existing immunity to influenza, particularly those with high amounts of anti-HA memory B cells, may have a reduced boost after vaccination.
1:06:07 Neuraminidase as a Vaccine Target: Targeting conserved regions of neuraminidase, such as the active site, could potentially lead to the development of universal influenza vaccines.
1:08:53 Structural Features of Broadly Inhibitory Antibodies: Broadly inhibitory anti-neuraminidase antibodies often have a long variable region that fits into the active site, mimicking the binding of sialic acid.
1:11:55 Antibody 4C402: This antibody demonstrates broad inhibition of neuraminidase activity against different influenza strains and subtypes.
1:15:48 Mechanisms of Neuraminidase Inhibition: Antibodies can inhibit neuraminidase by blocking the active site or by binding to surrounding residues, affecting the enzyme's activity.
1:17:06 Cryo-EM Structure of Antibody-Neuraminidase Complex: Cryo-EM analysis revealed that one antibody binds to two neighboring neuraminidase protomers, potentially enhancing its inhibitory activity.
1:20:17 In Vivo Protection: The broadly inhibitory antibody 4C402 protected mice from severe disease and mortality in an H1N1 influenza infection model.
1:24:24 Listener Picks: The hosts discuss listener-submitted picks, including a social media post about a news host criticizing a former classmate, a card game called "Dear Reviewer 2" designed to help scientists respond to reviewer critiques, and information about the National Data Buoy Center.
1:36:53 "The People's Hospital" Book Recommendation: A listener recommends Dr. Ricardo Nuila's book, "The People's Hospital: Hope and Peril in American Medicine," which highlights the importance of county hospitals in providing care for uninsured and underinsured populations.
1:42:24 World Radiotelegraphy Championships: An audio program from the BBC documents the world championships of Morse code, highlighting the skill and speed of participants, particularly from Eastern Europe.
1:44:40 Most Studied Bacteria: A study using AI found that the majority of research focuses on only 20 bacterial species, with E. coli being the most studied, while thousands of other bacterial species remain largely unexplored.